The best way to facilitate the development of effective IT risk scenarios is to utilize a cross-functional team. A cross-functional team is a group of people with different skills, expertise, and perspectives who work together to achieve a common goal. A cross-functional team can help to create realistic, comprehensive, and relevant IT risk scenarios by bringing diverse knowledge, experience, and insights from various domains and functions. A cross-functional team can alsohelp to identify and address the interdependencies, interactions, and impacts of IT risks across the organization. The other options are not the best ways to facilitate the development of effective IT risk scenarios, although they may be useful or necessary depending on the context and nature of the IT risks. Participation by IT subject matter experts is important, but it is notsufficient, as IT risks may affect or be affected by non-IT factors and stakeholders. Integration of contingency planning is a part of the risk response process, which follows the risk scenario development process, but it is not the same as creating the risk scenarios. Validation by senior management is a quality assurance step that ensures the accuracy and completeness of the risk scenarios, but it is not the same as facilitating the development of the risk scenarios. References = Six Steps to Using Risk Scenarios for Improved Risk Management, IT Risk Scenarios - Morland-Austin, IT Risk Resources | ISACA